 From 1432 until 1433, he commandeered the Hanseatic fleet fighting Frisian looters, culminating in the destruction of the Frisian pirate base Sebaldusburg and occupation of their capital Emden.For his merits in the fight against the enemies of the Hanseatic League, he was named the only "honorary Mayor" of the city of Hamburg in 1433.Simon of Utrecht died on 14 October 1437 in Hamburg and was buried in the St. Nikolai Church in Hamburg.